THE HORMONES IN HUMAN REPRODUCTION 



Each canal is really the continuation of one of the oviducts. 

 At their lower ends the uterus enters the last part of the 

 genital tract, namely the vagina. In most animals the two 

 canals of the uterus unite before they enter the vagina, form- 

 ing a Y-shaped organ, with a single stem and two horns 



UTERUS 



OVIDUCT 

 (FALLOPIAN TUBE) 



Fig. 11. Diagram of the human female reproductive tract. The uterus, 

 and the oviduct at the right, are depicted as if laid open by removing the 

 nearer half. The vagina is drawn as if fully distended. In part after a 

 drawing by R. L. Dickinson in his Human Sex Anatomy. 



(Fig. 10, E), but the extent of this fusion differs very much 

 in different animals. In rabbits the two horns remain entirely 

 separate and enter the vagina independently, side by side 

 (Fig. 10, C). In monkeys, apes, and humans the opposite 

 extreme is found, for even the horns fuse together, closing 

 the Y and making a single-chambered uterus into which the 

 two oviducts are inserted as shown in the diagram, Fig 11. 



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